Improvement



T. T. STRODE.

Adding Machine.

No. 49,168. Patented Aug. 1, 1865.

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UNITED STATES T. T. STRODE, OF MORTONVILLE. PENNSYLVANIA.

IMPROVEMENT lN ADDING-MACHINES.

Specification forming part of Letters Patent No. 49,168, dated August 1,1665.

T 0 all whom it may concern.-

Be it known that I, T. T. STRODE, ofMortonville, in the county ofChester and State of Pennsylvania, have invented a new and ImprovedAdding-Machine; and I do hereby de clare that the following is afull,clear, and exact description thereof, which will enable others skilledin the art to make and use the same, reference being had to theaccompanying d rawings, forming part of this specification, in whichFigure l is a sectional plan or face view of this invention. Fig. 2 is atransverse vertical section of the same, the line 00 00, Fig. 1,indicating the plane of section.

Similar letters of reference indicate like parts.

This invention consists in the employment or use of a revolving diskmarked on its rim with a series of figures, commencing at 1 and endingat 100, or any other figure, and provided with cavities to receive a pinby means of which said disk can be rotated, and with a helical or camgroove in its ace to operate in combination with a stationary abutment,and with ahinged index and stationary dial marked with figures from 1 to100 near its circumference,and with other figures, from 1 to 16, more orless, on the sides of a segmental slot, in which the index plays in sucha manner that by inserting a pin in one of the cavities opposite to anydesirable figure on the circumference of the dial, the revolving diskcan be turned on its axis for a distance equivalentto the figure whichwas opposite the respective cavity, and at the same time the index movesin the cam-groove and the figure in question is registered, and byrepeating the operation with the same or other figures said figures areadded up and the sum registered on the dial and disk.

A represents a disk, made of wood 0 any other suitable material, whichis attached to a bed-plate, B, by means of a central pivot, a, on whichthe same revolves freely. Said disk is marked on its circumference withfigures from 1 to 100; or, if the same is large enough, still morefigures may be added in consecutive order, and it is provided with aseries of cavities, b, one opposite to each of the figures-or at leastcorresponding in number to the number of figures-marked on the edge ofthe disk. The face of the disk is furnished with a helical or camgroove, 0, and said disk revolves under a stationary dial, 0. Thediameter of this dial is such that its edge extends close to thecavities in the disk, as clearly shown in Fig. 1 of the drawings, and itis marked on its face, near its circumference, with a series of figures,from 1 to 100, more or lessone figure for each cavity.

D is the index, which is hinged to the dial 0 by means of a pivot, d,and a nose or lip, 0, projects from this index through a segmentals1ot,f, in the dial into the cam-groove c. The sides of the slot aremarked with figures from 1 to 16, more or less, and a stationaryabutment, E, which projects over the edge of the disk, limits the rotarymotion of the same or prevents a pin inserted into one of the cavitiesfrom being carried round and round. This abutment is opposite thefigures 100 on the dial, or in such a position that by inserting a pininto a cavityt'or instance, that opposite the figure 20-and carrying thesame along until it strikes the abutment the motion thus imparted to therevolving disk corresponds to the figure 20.

The operation of my machine will be easily understood from an example.If itis desired to add up the following figures: 78, S9, 65, 56, 40, thedisk A is turned back until the figure 100 marked on its edge is closeto the abutment, and the index is moved back immediately after the diskby catching the fingernail underits outer end and lifting said end upout of the grooves and then turning it back and dropping it into thefirst groove, and the pin is then inserted into the cavity opposite thefigure 78 and the disk turned in the direction of the arrow marked on itin Fig. 1 until the pin strikes the abutment. Said pin is then withdrawnand inserted in the cavity opposite the figures 89 on the dial and thedisk again turned until the pin strikes the abutment, &c., for each ofthe succeeding figures, 65, 56, 40, and the same is shown by the indexand by the figure on the disk next the abutment. The index shows thehundreds and the figures on the disk the odds below 100. The sum is 328.

It will be noticed by the action of the canr groove 0 the indexis movedup in the segmental slot, so that for each 106 one of the figures markedon the sides of the slot is exposed un- 'der the outer edge of theindex.For instance,

The revolving disk A, marked with figures on its circumference, andprovided with a camgroove, 0, and with cavities Z), in combination withthe slotted dial 0 andindex D, constructed and operating substantiallyas and for the purpose set forth.

THOMAS T. STRODE.

Witnesses:

RoB'r. B. STEEN, JAMES WILsoN.

